Next Article in Journal
Current/Voltage Controlled Quadrature Sinusoidal Oscillators for Phase Sensitive Detection Using Commercially Available IC
Next Article in Special Issue
Ultrahigh Resolution Thickness Measurement Technique Based on a Hollow Core Optical Fiber Structure
Previous Article in Journal
Sensor-Integrated Microfluidic Approaches for Liquid Biopsies Applications in Early Detection of Cancer
Previous Article in Special Issue
Ethanol Gas Sensitivity Sensor Based on Roughened POF Taper of Modified Polypyrrole Films
Open AccessArticle

The Field Monitoring Experiment of the Roof Strata Movement in Coal Mining Based on DFOS

Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(5), 1318; https://doi.org/10.3390/s20051318
Received: 4 January 2020 / Revised: 7 February 2020 / Accepted: 25 February 2020 / Published: 28 February 2020
(This article belongs to the Special Issue Optical Fiber Sensors and Photonic Devices)
Mining deformation of roof strata is the main cause of methane explosion, water inrush, and roof collapse accidents amid underground coal mining. To ensure the safety of coal mining, the distributed optical fiber sensor (DFOS) technology has been applied in the 150,313 working face by Yinying Coal Mine in Shanxi Province, north China to monitor the roof strata movement, so as to grasp the movement law of roof strata and make it serve for production. The optical fibers are laid out in the holes drilled through the overlying strata on the roadway roof and BOTDR technique is utilized to carry out the on-site monitoring. Prior to the on-site test, the coupling test of the fiber strain in the concrete anchorage, the calibration test of the fiber strain coefficient of the 5-mm steel strand (SS) fiber, and the test of the strain transfer performance of the SS fiber were carried out in the laboratory. The approaches for fiber laying-out in the holes and fiber’s spatial positioning underground the coal mine have been optimized in the field. The indoor test results show that the high-strength SS optical fiber has a high strain transfer performance, which can be coupled with the concrete anchor with uniform deformation. This demonstrated the feasibility of SS fiber for monitoring strata movement theoretically and experimentally; and the law of roof strata fracturing and collapse is obtained from the field test results. This paper is a trial to study the whole process of dynamic movement of the deformation of roof strata. Eventually the study results will help Yinying Coal Mine to optimize mining design, prevent coal mine accidents, and provide detailed test basis for DFOS monitoring technique of roof strata movement. View Full-Text
Keywords: roof strata movement; distributed optical fiber sensing technology; optical fiber sensing performance; optical fiber strain transfer performance; anchorage coupling experiment roof strata movement; distributed optical fiber sensing technology; optical fiber sensing performance; optical fiber strain transfer performance; anchorage coupling experiment
Show Figures

Figure 1

MDPI and ACS Style

Hu, T.; Hou, G.; Li, Z. The Field Monitoring Experiment of the Roof Strata Movement in Coal Mining Based on DFOS. Sensors 2020, 20, 1318.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop